linux/3.2: add XZ decompression support to ubifs

SVN-Revision: 30793

diff --git a/target/linux/generic/patches-3.2/541-ubifs-xz-decompression-support.patch b/target/linux/generic/patches-3.2/541-ubifs-xz-decompression-support.patch
new file mode 100644 (file)
index 0000000..3c917c1
--- /dev/null
+++ b/target/linux/generic/patches-3.2/541-ubifs-xz-decompression-support.patch
@@ -0,0 +1,94 @@
+--- a/fs/ubifs/Kconfig
++++ b/fs/ubifs/Kconfig
+@@ -5,8 +5,10 @@ config UBIFS_FS
+       select CRYPTO if UBIFS_FS_ADVANCED_COMPR
+       select CRYPTO if UBIFS_FS_LZO
+       select CRYPTO if UBIFS_FS_ZLIB
++      select CRYPTO if UBIFS_FS_XZ
+       select CRYPTO_LZO if UBIFS_FS_LZO
+       select CRYPTO_DEFLATE if UBIFS_FS_ZLIB
++      select CRYPTO_XZ if UBIFS_FS_XZ
+       depends on MTD_UBI
+       help
+         UBIFS is a file system for flash devices which works on top of UBI.
+@@ -42,6 +44,14 @@ config UBIFS_FS_ZLIB
+       help
+         Zlib compresses better than LZO but it is slower. Say 'Y' if unsure.
+ 
++config UBIFS_FS_XZ
++      bool "XZ decompression support" if UBIFS_FS_ADVANCED_COMPR
++      depends on UBIFS_FS
++      default y
++      help
++        XZ compresses better the ZLIB but it is slower. 
++        Say 'Y' if unsure.
++
+ # Debugging-related stuff
+ config UBIFS_FS_DEBUG
+       bool "Enable debugging support"
+--- a/fs/ubifs/compress.c
++++ b/fs/ubifs/compress.c
+@@ -71,6 +71,24 @@ static struct ubifs_compressor zlib_comp
+ };
+ #endif
+ 
++#ifdef CONFIG_UBIFS_FS_XZ
++static DEFINE_MUTEX(xz_enc_mutex);
++static DEFINE_MUTEX(xz_dec_mutex);
++
++static struct ubifs_compressor xz_compr = {
++      .compr_type = UBIFS_COMPR_XZ,
++      .comp_mutex = &xz_enc_mutex,
++      .decomp_mutex = &xz_dec_mutex,
++      .name = "xz",
++      .capi_name = "xz",
++};
++#else
++static struct ubifs_compressor zlib_compr = {
++      .compr_type = UBIFS_COMPR_XZ,
++      .name = "xz",
++};
++#endif
++
+ /* All UBIFS compressors */
+ struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
+ 
+@@ -233,9 +251,15 @@ int __init ubifs_compressors_init(void)
+       if (err)
+               goto out_lzo;
+ 
++      err = compr_init(&xz_compr);
++      if (err)
++              goto out_zlib;
++
+       ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr;
+       return 0;
+ 
++out_zlib:
++      compr_exit(&zlib_compr);
+ out_lzo:
+       compr_exit(&lzo_compr);
+       return err;
+@@ -248,4 +272,5 @@ void ubifs_compressors_exit(void)
+ {
+       compr_exit(&lzo_compr);
+       compr_exit(&zlib_compr);
++      compr_exit(&xz_compr);
+ }
+--- a/fs/ubifs/ubifs-media.h
++++ b/fs/ubifs/ubifs-media.h
+@@ -332,12 +332,14 @@ enum {
+  * UBIFS_COMPR_NONE: no compression
+  * UBIFS_COMPR_LZO: LZO compression
+  * UBIFS_COMPR_ZLIB: ZLIB compression
++ * UBIFS_COMPR_XZ: XZ compression
+  * UBIFS_COMPR_TYPES_CNT: count of supported compression types
+  */
+ enum {
+       UBIFS_COMPR_NONE,
+       UBIFS_COMPR_LZO,
+       UBIFS_COMPR_ZLIB,
++      UBIFS_COMPR_XZ,
+       UBIFS_COMPR_TYPES_CNT,
+ };
+